What type of grease must be used for general use on bike bearings. I hear there is a special bycycle grease or can one use a normal Multipurpose grease. I also assume that "bearing grease" (black stuf that looks as it has graphite or molydenum should not be used) can I use copper grease to grease the saddle post. This must be done once in six months to stop the aluminium from "freezing" to the frame. Any help would be appreciated.
I think you're OK with moly grease in most applications. Occasionally I play about with teflon based stuff, which is great, but too heavy going on pawls & springs etc.
For dissimilar material isolation, search for 'Tef-gel'. Amazingly expensive, but top shelf results all the same. We use it in the marine trade, it's available from certain marine suppliers.
I phoned one of the large lube suppliers today. He advised against Moly Grease. He reckons the suspended moly might not be good for the bearings taking a lot of strain at fairly low speeds (does not sound right) and working in rather aggressive environments. He reckons normal Multipurpose grease should do the job. Do not buy a expensive grese gun but use an inexpensive diposable syringe that you buy form the chemist. Works very well.